Grinding-mill.



No. 656,809. Patented Aug. 28, I900.. T. CASCADEN, .IR. GRINDING MILL(Application filed Sept. 2, 1899.)

4 SheetsSheet (NO Model.)

.." ulll No. 656,809. Patnted Aug. 28, I900. T. CASCADEN, In.

GRINDING MILL.

[Application filgd Sept. 2, 1899.) (No Model.) 4 Shaats$haet- 2.

No. 656,809. Patented Aug. 28, I900.

T. CASCADEN, 1R.

GRINDING MILL.

(Application filed Sept. 2, 1899.)

(No Model.) 4 S heets-Sheet 3.,

m: "ohms PETERS co, PHOTQ-LH'HO.WA5H1NGYON. n. a.

No. 656,809. Patented Aug. 28, I900. T. CASCADEN, .IR. GRINDING MILL.

(Application filed Sept. 2, 1899.)

4 Sheets-Sheet 4.

(No Model.)

Ida/c252 I THOMAS OASOADEN, JR, OF VVATERLOO, IOWA, ASSIGNOR TO THEDAVIS GASOLINE ENGINE VORKS COMPANY, OF SAME PLACE.

GRINDING IVHLL.

SPECIFICATION forming part of Letters Patent No. 656,809, dated August28, 1900. Application filed September 2,1899. $erial No. 729,292. (Nomodel.)

ing-mills commonly known as feed-mills,

- IO such mills being more especially adapted for the grinding of cornor other grain to be used as food for stock. The invention is moreparticularly designed for the improvement of that class of feed-millscommonly termed I duplex mills, an example of such type of mills beingillustrated in Letters Patent No. 622,91et, granted to the DavisGasoline Engine Works Company as assignee April 11,

1899. Features of the invention are applicazo ble to other styles ofgrinding-mills in which the power-is applied by means of a sweep towhich a team of horses is attached.

Figure l is a plan view of a mill embodying my invention.

tion. Fig. 3 is a view in section on line 3 3 of Fig. 1. Fig. 4 is anenlarged View in central vertical section. Fig. 5 is a detail view insection on line 5 5 of Fig. 4. Fig. 6 is a view in section on line 6 6of Fig. 4. Fig. 7

0 is a detail plan view of the hub of the outer cone. Fig. 8 is a Viewsimilar to Fig. 4, but

showing a somewhat-modified form of the illvention. Fig. 9 is a Viewsimilar to Fig. 4:,

but showingfurther modifications. Fig. 10is a detail view in centralvertical section through the hub and sleeve of the cone-shell.

Figs. 11 and 12 are detail views in plan and elevation of thebearing-piece shown in Fig. 9.

A difficulty heretofore encountered in the 0 operation of that class ofgrinding-mills in which a draft-sweep is employed for impartingrevolution to the movable bur or bins of a mill-is that the weight ofthe sweep and the vertical movement thereof are found to 5seriouslyinterfere with the nice adjustment and successful action of themill, the sweep being usually attached to lugs that project laterallyfrom the outer shell of the mill.

In order to overcome this objection, it has been heretofore proposed toprovide the outer end of the draft sweep with a carrying- Fig. 2 is aview in elevawheel; but while such arrangement was a de-' cidedadvantage when working upon level ground it has been found that wherethe ground was muddy and rough or frozen the irregular movements of thewheel caused like irregular movements of the sweep, thereby tilting theshell of the mill and causing the burs to grind unevenly, so that attimes whole grain would pass through the mill.

The object of the present invention is to overcome the above objection,and this object I have accomplished by providing the sweep with acarrying-wheel and by providing around the base of the mill a trackwhereon this wheel shall travel, so that regardless of the condition ofthe ground an even and uniform movement of the sweep will be had, whileat the same time the shell of the mill is relieved in great measure fromthe weight of the sweep.

In the operation of duplex feed -1nills-- such for example, as thatillustrated in Letters Patent No. 622,914great difficulty has beenencountered in obtaining a uniform grinding action of both sets of burs.This has been due to the fact that While the inside bur car ried by theinner cone was hanging down free to respond to the adjusting-screw, theoutermost bur being at all times pressed toward its companion bur on thecone-shell by the weight of the heavy outside shell and of the cone, andas well, also, by the weight of the sweep, had a tendency to grind toofine.

A further object of my present invention is to provide means wherebyan'independent adjustment of the inner and outer burs can be effected,so that a uniform grinding action of both sets of burs shall result.

The invention consists in the features of improvement hereinafterdescribed, illustrated in the accompanying drawings, and particularlypointed out in the claims at the end of this specification.

A designates any usual or suitable form of 5 box or base whereby themill will be supported, and to this box or base A are bolted the lugs b,that extend radially outward from the bottom of the cone-shell B of themill. To the lower part of the coneshell B are attached the burs 2 and 3of any suitableconstruetion, the bur 2 being adapted to cooperate with acorresponding bur a, that is carried by the bottom part of the outershell 0 while the bur 3 cooperates with a corresponding bur 5 ofsuitable construction, formed upon or attached to the lower part of thecone D. Outer shell 0 is provided with the usual hopper, by means ofwhich and the outer shell and inner cone the material to be ground isdelivered to both sets of grindingsurfaces. In the construction shownthe intermediate cone-shell B is stationary, while the outer shell 0 andthe inner cone D revolve, and the connection between these several partswill be hereinafter more fully de scribed. Extending around the bottomof the mill and preferably supported by the base A is a circular trackT, upon which will travel a carrying-wheel V, that is connected with adraft sweep TV. The side bars of the draft-sweep W will be attached inthe usual way to lugs 0 that project from the outer shell 0. Between theside bars of the sweep WV extends a cross-bar w, to which is pivotallyconnected, as by bolt to, the bracket 20 from which projects thejournal-stud v of the carrying-wheel V. The journal-bracket w is shownas formed with a horizontal flange w (see Fig. 4,) which when in normalposition extends beneath and supports the crossbar to of thesweep-frame. From this construction it will be seen that as thesweepframe is carried around the mill by the draftteam the weight ofthis sweep-frame will be sustained in great part by the carrying-wheelV, and inasmuch as the wheel travels close to the base of the mill theweight of the outer end of the sweep has a tendency to lift orcounterbalance the outer shell 0, so that the outer burs can betterclear themselves, and thus enable a more uniform action of such burs tobe had, while at the same time pre venting unnecessary wear upon theburs, as was the case in the old-style mills in which the entire weightof the sweep and the outer shell were carried by the burs. Moreover, byconnecting the carrying wheel to the sweep-frame by the pivoted bracket,as I prefer to do, it will be observed that when the sweep-frame risesfor any reason the wheel still continues to travel upon the track andthe bracket receives the weight of the sweepframe as it returns tonormal position.

It will be understood that while the improved means above described areparticularly applicable to duplex mills still they may be employed withadvantage in connection with other types of feed-mills.

The improved means whereby an independent adjustment of the inner andouter grinding-burs of the mill is effected will be understood byreference to Figs. 4 to 7 of the drawings and to the modifications shownin Figs. 8 to 12. The upper part of the cone D is shown as provided witha post d, around which sets the hub b of the cone-shell B, the body ofthe cone-shell B being connected with its huh I) by the usual toothedarms b Around the upper part of the cone-post 61 fits the hub c of theouter shell 0, the hub 0 being connected with the shell C- by the usualor suitable toothed arms 0. The hub c is suitably keyed to the upper endof the cone post d, so that the cone D shall be driven in unison withthe outer shell, and this keying of the cone-post d to the hub 0 can beeffected either by forming the upper part of the conepost and theinterior of the hub c of polygonal shape or by forming the cone-postwith grooves to receive ribs projecting inwardly from the hub c. On topof the hub c is a cap E, through which extends the temper-screw F, thatcarries at its top a suitable handwheel or turning device f, whereby thescrew may be operated. The temper-screw F passes down. through thecone-post d and its lower threaded end is provided with a nut f, thatsets within a polygonal recess 01 at the base of the cone-post. Thescrew F has fixed thereon a collar f that bears against the top of thecap E, (or upon a washer resting thereon.) Hence it will be seen thatwhen the temper-screw F is turned it will draw the outer bur 4, carriedby the shell 0, toward the stationary bur 2 at the base of the coneshellB and will limit the upward movement of the outermost bur at and of theshell during the grinding action. This turning of the temper-screw Fwill also raise the inner cone D, and in practice the initial adjustmentof both sets of burs 2 and l and 3 and 5 may be effected by thetemper-screw F until the outside burs 2 and 4 are at the point forgrinding to the desired degree of fineness, while the independentadjustment of the inner set of burs 3 and 5 will be accomplished,preferably, by the means next to be described.

Around the cone-post d extends abearingpiece or collar G, that bearsagainst the hub 19 of the inner or stationary cone-shell B. With thecollar G engage the upper ends of adjusting bolts H and H, that extendaround through the upper part of the cone D and have their lowerthreaded ends fitted with adjusting nuts or wheels 77.. Hence it willbeseen that by turning the adjusting-nuts h the cone D can be raised so asto bring the bur 5 into such proper position with respect to thecompanion bur 3 that this inside set of burs shall grind to the desireddegree of fineness. Inasmuch as the collar G is loose upon the cone-post01, so as to move in Vertical direction, it will be seen that the cone Dcan be freely raised or lowered, while the collar G maintains itsbearing upon the hub g of the cone-shell B.

So far as I am aware myinvention presents the first instance of a duplexmill in which there is employed a stationary part, such as a cone-shellcarrying inner and outer grinding-burs that cooperate with correspondingburs upon an outer shell and an inner cone, in combination with abearing-piece that en gages this stationary part or cone-shell and isconnected by adjusting devices with a partcarrying one of the burs to beadjusted.

In carrying out the invention it is manifest that the details ofconstruction may be varied widely by the skilled mechanic, and in Figs.7 to 12 of the drawingsI have illustrated one modified form whereby theindependent adjustment of the burs can be effected. In these embodimentsof the invention, as in that already described, the cone-shell B isstationary, while the cone D and outer shell 0 are.revoluble. The cone Dis supported by a pillar K, the upper end of which engages a recess atthe base of the cone-post (Z, while its lower end sets in a seat 'm,that is formed in the bridge-tree M. This bridge-tree M is shown assuspended by through-bolts 6 and 7 from the arms I) at the base of theconeshell B, and the through-bolt 7 has its lower threaded end providedwith an adjusting hand-wheel 8, by means of which the cone D can beraised in order to bring its bur 3 into proper relation with respect tothe companion bur 5 on the cone-shell B. In the modified form of theinvention shown in Fig. 8 the bearing-piece or collar G, that encirclesthe cone-post cl, extends beneath the hub b of the cone-shell B, andthrough this collar pass the arms 19 of the temper-screw P. The upperthreaded end of this temper-screw P is engaged by a hand-wheel P, thatbears upon the upper end of a sleeve R, that rises from the top of thecap E, this cap E resting upon the hub c of the outer shell 0. From theforegoing description it will be seen that by turning the handwheel Pthe temperscrew P will draw downward the outer shell 0 until the bur 4at the base of this shell is brought into proper relation with respectto the companion bur 2 for effecting the grinding of the grain to thedesired degree of fineness.

WVith previous constructions in which the adjustments of both sets ofgrinding-surfaces have not been independent there is a-tendency, asalready pointed out, for the outer burs to grind finer than the innerburs, since the construction is such that the weight of the parts tendsto force the outer burs together and the inner burs apart; but by meansof the independent adjustments of my improved device the outer set ofburs may be first adjusted to grind at the proper degree of fineness,which adjustment will serve as an indicator by which the inner set ofburs may be properly adjusted to grind to the same degree of fineness.

In the form of the invention shown in Figs. 9 to 12 of the drawings thecentral part or apex of the cone D is formed not only with a seat toreceive the upper end of the pillar K, but is also recessed or coredout, as at d and 01 to receive the bearing-piece G which in this form ofthe invention is shown as an inverted T-shaped plug having a threadedhole to receive the lower threaded end of the temper-screw F. The shankg of the bearingpiece G2 is inserted in the circular recess d of theextended upper part of the cone D, while the arms 9 of thisbearing-piece project through the sides of the recess d of the cone D,and upon these arms g rests the huh I) of the cone-shell B. The hub c ofthe outer shell is keyed to the hub of the cone, as in the constructionsheroinbefore described. From the foregoing description it will be seenthat the adjustment of the inner cone D will be effected by thehand-wheel 8, the bridgetree M, and pillar K, While the adjustment ofthe shell 0 will be effected by means of the temper-screw F and thebearing-piece G since manifestly by turning the temper-screw F the shell0 and its bur can be drawn downward toward the cone-shell.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a grinding-mill the combination with the revoluble bur and withthe sweep-frame connected therewith, of a carrying-wheel attached to thesweep-frame at a point adjacent the base of the mill and acting as afulcrum by which the sweep partly counterbalances the revoluble bur.

2. In a grinding-mill the combination with the revoluble bur and withthe sweep-frame connected therewith, of a track extending around thebase of the mill and a carryingwheel attached to the sweep-frameadjacent the mill and adapted to travel on said track.

3. In a grinding-mill the combination with the revoluble bur and withthe sweep-frame connected therewith, of a track extending around thebase of the mill, a carrying-wheel attached to the sweep-frame andadapted to travel on said track and a journal-bracket for saidcarrying-wheel pivotally connected to the sweep-frame and having a partto support the sweep-frame and limit itsdownward movement.

4. In a duplex grinding-mill, the combination with a vertically-disposedstationary cone-shell, an inner revoluble cone, an outer revolubleshell, said several parts being provided with grinding-burs and meanscommon to both sets of grinding-burs for delivering thereto the materialto be ground, of means whereby one of said revoluble parts may beadjusted with respect to said stationary cone-shell, and means wherebythe other of said revoluble parts may be independently adjusted withrespect to said stationary coneshell and with respect to saidfirst-mentioned revoluble part,

5. In a duplex grinding-mill comprising an outer revoluble shell, aninner revoluble cone and an intermediate stationary cone-shell having acentral hub encircling the post of the inner cone, by which parts thegrindingburs are carried, the combination with the stationary cone-shelland its central hub, of a bearing-piece engaging said hub and adjustingmechanism between said bearingpiece and one of the revolublebur-carrying parts, whereby the bur carried by said revoluble part canbe adjusted toward its companion stationary bur.

6. In a duplex grinding-mill comprising an outer revoluble shell, aninner revoluble cone, anintermediate stationarycone-shellbywhich partsthe grinding-burs are carried and means common to both sets ofgrinding-burs for delivering thereto the material to be ground,thecombination with the stationary cone-shell, of abearing-piece connectedtherewith'and adjusting mechanism between said bearingpiece and one ofthe revoluble bur-carrying parts, whereby the bur carried by saidrevoluble part can be adjusted toward its companion stationary bur, andindependent adjusting mechanism whereby the other revoluble bur-carryingpart may be adjusted toward said stationary cone-shell.

'7. In a duplex grinding-mill comprising an outer revoluble shell, aninner revoluble cone and an intermediate stationary cone-shell by whichparts the grinding-burs are carried, the combination with the stationarycone-shell, of a non-revoluble bearing-piece and adjusting mechanismbetween said bearing-piece and one of the revoluble bur-carrying parts,whereby the bur carried by said revoluble part can be adjusted towardits companion stationary bur.

8. In a duplex grinding-mill comprising an inner cone, an outer shelland a stationary intermediate cone shell by which parts thegrinding-burs are carried, the combination with the cone-shell, of abearing-piece engaging its hub, adjusting-screw mechanism connected tosaid bearing-piece and extending through one of the adjacent revolubleparts and means whereby said screw mechanism may be adjusted to bringthe part through which it passes in closer proximity to the coneshell.

9. In a duplex grinding-mill the combination with an inner revolublecone having a cone-post, an outer revoluble shell, an inter mediatestationary cone-shell by which parts the grinding-burs are carried andmeans common to both sets of grinding-burs for delivering thereto thematerial to be ground, said cone-shell having a hub encircling said conepost, of a bearing-piece encircling said conepost and engaging the hubof the cone-shell, adj usting-screw mechanism connected to saidbearing-piece and leading through one of the adjacent bur-carrying partswhereby said our-carrying part can be adjusted toward the cone-shell,and means whereby the other of said bur-carrying parts can beindependently adjusted toward and from the stationary coneshell.

lO. In a duplex grinding-mill the combination with an inner revolublecone having a cone-post, an outer revoluble shell, an intermediatestationary cone-shell by which parts the grin ding-burs are carried andmeans common to both sets of grinding-burs for delivering thereto thematerial to be ground, said cone-shell having a hub encircling saidconepost, of a bearing-piece encircling said conepost and engaging thehub of the cone-shell, adjusting-screw mechanism connected to saidbearing-piece and leading through the top of the cone whereby said conemay be adjusted toward the cone-shell, and a temper-screw having abearing on the hub of the outer shell and adjustably connected to theconepost whereby the outer shell may be forced toward the cone-shell.

THOMAS OASOADEN, JR.

Witnesses:

J OHN T.. SWIFT, FREDERICK B. BALLOU.

